Adolescent game involving two participants sitting opposite each other at a small table. Taking turns, a quarter is spun and one of the players attempts to catch it upright with one finger. Achieving this, said player will fling the quarter at his opponent's knuckles which are pressed firmly against the table. If the player is unable to catch the quarter in the above mentioned manner, his turn is over.
The first player to either give up or bleed is the loser.
Note: Various coins may be substituted from small to large. The quarter is recommended, however, due to its mass, serrated edge, and relative ease of catching. In skilled hands, it is capable of delivering a one shot KO.
Scott and Greg were playing bloody knuckles in the cafeteria.